نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری آبیاری و زهکشی، گروه آبیاری و آبادانی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران و محقق بخش تحقیقات خاک و آب مرکز تحقیقات

2 استاد، آبیاری و زهکشی گروه آبیاری و آبادانی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران.

3 استادیار، موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران.

4 استادیار موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران

چکیده

چکیده
پتانسیل بهره­وری آب اقلیمی (PCWP) شاخصی مهم برای کمی‌سازی اثربخشی عوامل ذاتی بر بهره­وری فیزیکی است. یکی از عوامل مهم مؤثر بر این شاخص تقویم زراعی است. با توجه به اهمیت زراعت ذرت و ضرورت ارتقای بهره­وری آب، شاخص PCWP  برای هشت تقویم زراعی و پنج مزرعه ذرت در سال زراعی 95-1394 بررسی شد. تقویم­های زراعی از منابع رسمی موجود و جلسات کارشناسی احصا شد. اجزایPCWP از مدل رشد فائو (عملکرد) و روش استاندارد پنمن- مانتیث- فائو (تبخیر- تعرق) تعیین شد. برای ذرت ­علوفه­ای میانگین PCWP در کشت دوم نسبت به کشت اول 23 درصد افزایش داشت و از منظر ارتقای بهره­وری آب تقویم­های کشت دوم توصیه می­شود. با وجود افزایش 7/13 درصدی PCWP در کشت دوم ذرت دانه­ای، استفاده از تقویم­های کشت اول توصیه می­شود. با توجه به تغییرات بهره­وری آب (WP) و اجزای آن، تخصیص آب و برنامه­ریزی آبیاری بر مبنای ETc و متناسب با تقویم زراعی ضروری است. برای مقایسه و تحلیل درست در انتخاب تقویم زراعی، استفاده از WP بر مبنای ETc و عملکرد واقعی مناسب نبوده و لازم است از مقادیر PCWP بر مبنای پتانسیل تولید اقلیمی (CPP) در شرایط آبی (IPP) و ETc استفاده شود.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the Effect of Crop Calendar on the Potential Climatic Water Productivity (PCWP) of Maize in Moghan Plain

نویسندگان [English]

  • ali akbar azizizohan 1
  • abdolmajid liaghat 2
  • Mehdi Shahabifar 3
  • Seyed Alireza Seyed jalali 4

1 Ph.D. student, Irrigation and Reclamation Engineering Department, University of Tehran and Research Department, South Khorasan Agricultural and Natural Resources Research and Education Center, AREEO, Birjand, Iran

2 Professor, Irrigation and Reclamation Engineering Department, University of Tehran, Karaj

3 Assistant Professor, Soil and Water Research Institute(SWRI), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

4 Assistant Professor Soil and Water Research Institute (SWRI), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

چکیده [English]

The Potential Climatic Water Productivity (PCWP) is an important indicator to quantify the effect of intrinsic factors on physical water productivity. The crop calendar is one of the important factors affecting this index. Considering the importance of maize farming and the necessity of improving water productivity, PCWP index has been investigated for eight agronomic calendars and five maize farms between 2015 and 2016. Crop calendars were extracted from available official sources and expert meetings. The PCWP components are determined from the FAO Growth Model (yield) and the standard FAO Penman-Monteith method (evapotranspiration). The mean PCWP for maize forage in the second crop cultivation has increased by 23%, compared to the first cultivation; therefore, the use of second cultivation calendars is recommended in regard to the promoting water productivity. In spite of a 13.7% increase in PCWP in the second maize-grain cultivation, the use of the first cultivation calendars is recommended. Due to changes in water productivity (WP) and its components, water allocation and irrigation scheduling based on ETc appropriate to the crop calendar is essential. However, WP based ETc and actual yield are not appropriate for correct comparison, analysis, and crop calendar selection, so it is necessary to use PCWP values based on climatic potential production (CPP) under water conditions (IPP) and ETc.

کلیدواژه‌ها [English]

  • Climatic Production Potential (CPP)
  • Evapotranspiration (ET)
  • Planting Date
  • Water Productivity (WP)
  • Water Use Efficiency (WUE)
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